Fix build scripts, as per comments in the google group.

Change cmake minimum required version to 2.8.

Use copy_directory for Sophia and LuaJIT, this should
fix stupid errors when rebuilding after a pull.
Exclude src/trivia/config.h from source install.
Merge branch 'master' of github.com:tarantool/tarantool
Update a result file after merge with the master (multi-master replication).